Why does my car cool down when idling?
If your car begins to overheat when idling, but the temperature gauge moves back down once you get going, it’s most likely due to a broken radiator fan. When the coolant goes to the radiator, it’s spread over a large surface area to cool it down. Airflow further cools it before it returns to the engine.
What happens if a car sits idle for too long?
“If your vehicle sits idle for too long, the battery could die, the tires can develop flat spots and the engine oil may start to deteriorate. Vehicles that sit idle too long can develop flat spots, so taking a brief drive every once in a while will help prevent bald spots, and recharge the battery, too.
How long is too long for a car to be idle?
You can just rev up the engine and drive even if it’s a cold morning. So is it bad to let your car idle? However, you should not leave the vehicle in that state for a long time (more than 30 minutes) because it will burn fuel and cause damage to the environment by releasing exhaust fumes.
What causes a car to stall at idle?
The way diesel engines produce power is different from gasoline engines. Every time the injectors push fuel and air into the chamber, the spark plugs deliver the electrical current. This keeps the engine running. If you have a weak or poor quality spark plug, then it is possible that it will lead to car stalling.
What happens to fuel usage when going down a hill?
The answer depends a great deal on the control system around the engine, and how fast you are going down the hill relative to the gear you are in. For a basic engine system, like 1960s or earlier, at idle throttle setting the fuel usage would go up a bit with engine speed.
What causes an idle surge in an engine?
An idle surge can be caused by multiple phenomena. If an engine is not getting enough fuel (this is called “running lean”), due to fuel pressure (regulated by the fuel pump and regulator), restricted fuel injectors, a vacuum leak or really anything that throws off the fuel mixture going in to the engine, this can cause the surge.
Why does my car step on the gas when going downhill?
This sort of effectively stepped on the gas for you when the engine was undergoing rapid deceleration, or was externally driven (rapid deceleration is being “externally” driven from the momentum of the engine). The reason was that this condition with low fuel input would cause more pollutants to be emitted.